Galactic Law was the system of law, similar to international law on Earth, held by many interstellar governments in Mutter's Spiral, and enforced by the Judoon. (DW: Smith and Jones)
One important document of Galactic Law was the Shadow Proclamation. (DW: Partners in Crime)
- Presumably, the Galactic Charter was also part of Galactic Law. (DW: The Stones of Blood)
Galactic Law said that developing worlds classed as Level 5 planets (such as Earth in the 21st century and earlier) could not be approached for legal matters, so they had no jurisdiction over the planet, and methods such as a H2O Scoop must be used to transport any places required to be visited to neutral territory, such as the Moon. (DW: Smith and Jones)